Mobile rock crushing apparatus



May 5, 1970 R. P. MAILLIARD MOBILE ROCK CRUSHING APPARATUS 6Sheets-Sheet 1 Filed June 16, 1967 II w INVENTOR.

my w 5 m M m M A P m m a h m R R. P. MAILLIARb May 5, 1970 MOBILE ROCKCRUSHING APPARATUS 6 Sheets-Sheet 2 Filed June 16, 1967 May 5, 1970 R.P. MAILLIARD MOBILE ROCK CRUSHING APPARATUS Filed June 16, 1967 6Sheets-Sheet 3 WM {Attorneys May 5, 1970 R. P. MAILLIARD MOBILE ROCKCRUSHING APPARATUS 6 Sheets-Sheet 4 Filed June 16, 1967 Fig. 5

INVENTOR.

MW W P M m May 5, 1970 R. P. MAILLIARD MOBILE ROCK CRUSHING APPARATUS 6Sheets-Sheet 5 Filed June 16, 1967 INVENTOR.

Richard P Mai/Hard w aZfl VMW m y/mw Attorneys M 5, 1970 R. P. MAILLIARDMOBILE ROCK CRUSHING APPARATUS 6 Sheets-Sheet 6 Filed June 16, 1967 mvwmvN wmw ANN

INVENTOR.

Richard P MaiI/iard WW Attorneys United States Patent US. Cl. 241--81 8Claims ABSTRACT OF THE DISCLOSURE Self-propelled rock crushing apparatushaving a pivotally mounted pickup conveyor which delivers the rock to'be crushed onto a screen which removes the dirt and small rockparticles and delivers the rock in plural paths to multiple crushers.

BACKGROUND OF THE INVENTION This invention relates to a rock crusherwhich is mobile and which can be utilized for crushing rock picked upfrom the road bed. There are many roads as, for example, county roads incertain areas which have been covered with aggregate or rock in whichthe top running surface is worn out. In such roads, there are often manylarge rocks which protrude above the surface. In addition, there isusually a berm along both edges of the road that contains rock which istoo large to use on the road. Thus, it is normally necessary to bring inaggregate at a great expense to recover the road. Equipment for crushingthe rock which is already on the road by travelling along the road hasnot been available commercially. There is, therefore, a need for aportable or mobile rock crusher which can be utilized for such purposes.

SUMMARY OF THE INVENTION The rock crushing apparatus consists of a frameand ground engaging wheels carried by the frame. An elevator assembly ismounted on the frame and delivers rock to the screen assembly. Thescreen assembly sorts the rock into two sizes and supplies the rocks tochutes. The chutes deliver the rock in plural paths to a multi-sectionrock crusher. The rock crusher crushes the rock and delivers it to theground underlying the frame as the apparatus is advanced.

In general, it is an object of the present invention to provide a rockcrushing apparatus which is readily capable of picking up rock from asurface and delivering it to a rock crusher and returning it to thesurface.

Another object of the invention is to provide apparatus of the abovecharacter which can readily reduce the rock to the desired size requiredfor the road bed in a single pass through the rock crusher.

Another object of the invention is to provide apparatus of the abovecharacter which has a relatively high capacity.

Another object of the invention is to provide a rock crusher of theabove character which can be operated by a single man.

Additional objects and features of the invention will appear from thefollowing description in which the preferred embodiments are set forthin detail in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a plan view of a mobile rockcrusher incorporating the present invention.

FIG. 2 is a cross-sectional view taken along the line 2--2 of FIG. 1.

FIG. 3 is an enlarged detail view of the front portion of the rockcrusher shown in FIG. 2.

FIG. 4 is a partial front elevational view looking along the line 44 ofFIG. 3.

FIG. 5 is a cross-sectional view taken along the line 5-5 of FIG. 3.

FIG. 6 is a cross-sectional view taken along the line 6-6 of FIG. 3.

FIG. 7 is a partial top plan view of the rock crusher shown in FIG. 1.

FIG. 8 is a cross-sectional view taken along the line 8-8 of FIG. 7.

FIG. 9 is a cross-sectional view taken along the line 99 of FIG. 8.

DESCRIPTION OF PREFERRED EMBODIMENT The mobile rock crushing apparatusconsists of a tractor 11 and a trailer 12 which is drawn by the tractor.The tractor 11 is provided with a frame 13 which carries front steerableground engaging wheels 14 and rear driven ground engaging wheels 16. Therear wheels 16 are driven in a suitable manner as, for example, by anelectric motor '17 mounted on a speed reducer 18 and driving adifferential 19 connected to the rear wheels 16. A drivers station 21 isprovided on the frame 13 with the necessary controls for controlling thetractor and operating the rock crushing apparatus.

A rock elevator assembly 26 is carried on the front portion of thetractor 11 and delivers rock which has been picked up by a conveyorassembly 27 also mounted upon the tractor. The conveyor assembly 27delivers the rock to the trailer 12.

The trailer 12 consists of a frame 31 which is provided with a pair ofrear ground engaging wheels 32. The trailer 12 is connected to thetractor 11 by a king pin assembly 33. It will be noted that the king pinassembly 33 generally overlies the rear ground engaging wheels 16 of thetractor 11. A vibratory screen assembly 36 is mounted upon the frontportion of the trailer 12 and is adapted to receive the rock as it isdischarged from the conveyor 27. The vibratory screen 36 delivers therock to a chute assembly 37 which delivers the rock to be crushed to therock crusher 38 mounted upon the frame 31.

Suitable means is provided for driving the rock crusher and consists ofa large diesel engine 41 mounted upon the rear of the trailer 12. Theengine 41 drives a speed reducing train 42 connected to a differential43 which drives shafts 44 which carry sheaves 46 which drive belts 47.The belts 47 drive sheaves 48 mounted upon a shaft 49 for the rockcrusher.

Suitable means is provided for generating electrical power for drivingthe various electrical motors on the mobile rock crusher. Thus, therehas been provided a power take-off 51 which drives belts 52. The belts52 drive a shaft 53 which is connected to an A.C. generator 54 mountedupon the trailer 12. It also drives a hydraulic pump 56 for supplyinghydraulic fluid under pressure.

The elevator assembly 26 consists of a lower section 58 and an uppersection 59. The lower section consists of a pair of spaced parallelframe members 61 which are box-like in cross-section as shown in FIG. 5.The upper extremities of the frame members 61 are provided with studshafts 62 pivotally mounted in bearing assemblies 63 mounted uponvertical posts 64 fixed to the main frame 13 of the tractor 11. Theframe members 61 extend downwardly as shown in FIG. 3 and have theirlower extremities supported at points which are just above the surfaceof the ground by suitable means such as a pair of caster wheels 68rotatably mounted in forked members 69. The forked members 69 are swivelmounted in brackets 71. The brackets 71 are pivotally mounted upon bolts72 secured to the frame members 61. Adjustment of the angularrelationship between the bracket 71 and the frame members 61 is providedby the bolts 73 extending through slots 74 provided in the bracket 71.

A pair of guide shoes 81 are mounted on the frame members 61 and divergeoutwardly in a forward direction. The guide shoes 81 are provided witharms 82 which are pivotally secured by bolts 83 to the lower extremitiesof the frame members 61 as shown in FIG. 3. Removable reinforcing wearplates 84 are provided on the lower extremities of the guide shoes 81. Abottom plate 86 is secured to and extends between the box-like framemembers 61 and has its lowermost extremity extend to the ground so thatit serves as a scoop for the elevator assembly.

The upper section 59 of elevator assembly 26 consists of a pair ofspaced parallel side frame members 91 which are also box-shaped incross-section. The side frame members 91 generally overlie the framemembers 61 and are pivotally connected thereto by hollow shafts 92 whichare mounted in pillow blocks 93 carried by brackets 94 affixed to theframe members 61. A large spro ket 95 is mounted on a shaft 96. Theshaft 96 is mounted in bearing assemblies 97 secured to the members 91.The sprocket 95 drives a large endless chain 98. The shaft 96 is drivenfrom an electric motor 99 through a right angle speed reducer 101. Theendless chain 98 travels over another large sprocket 102 mounted on ashaft 103 that is rotatably mounted in blocks 104. The shaft 103 extendsthrough slots 106 provided in the side frame members 91 and the blocks104 and shaft 103 are adjustable longitudinally of the frame members 91by screws 106 threaded into plates 107 afiixed to theside frame members91 so that the endlless chain 98 can be properly tensioned.

The endless chain 98 is a special type and consists of a plurality oflinks 108 which are interconnected by pins 109. A plurality ofscoop-like members 111 are mounted upon the endless chain 98 and securedthereto by pins 109. As can be seen from the drawings, the scooplikemembers 111 are provided with outwardly and for wardly curved portions111a. For each of the scoop-like members 111, there is provided aseparable reinforcing plate 112 which is carried by the link to the rearof the link to which the scoop-like member 111 is attached. This plate112 is provided with reinforcing gussets 113. The reinforcing plate 112and scoop-like member 111 are mounted on separate links to make itpossible for them to pass through the arcuate paths formed by thesprockets 95 and 102. While travelling between the sprockets, it can beseen that the reinforcing plates 112 back up and immediately follow thescoop-like members 111 to provide support thereto during the time theyare elevating rock.

A pair of side guide angle members 116 are mounted on the outer sides ofthe frame members 61 and extend upwardly from the side guide members 61to serve as guides for the upper section 59. Means is provided forsupporting the upper section 59 in a predetermined position with respectto the lower section 58 and consists of a pair of air operated actuators117, the lower extremities of which are secured to brackets 118 mountedon the side frame memebrs 61 and the upper extremities of which aresecured to brackets 119 carried by posts 121 affixed to the side framemembers 91. By operation of the actuators 117, it can be seen that theposition of the scoop-like members 111 relative to the bottom plate 86can be readily adjusted.

Means is provided for lifting the lower extremity of the elevatorassembly 26 off the ground so that the mobile rock crusher can be turnedaround and also to permit the travel of the same on highways and thelike. This means consists of a pair of hydraulic actuators 126. One endof each of the actuators 126 is pivotally mounted on a bracket 127affixed to the main frame 13 of the tractor and the other end ispivotally connected to the bracket 118 secured to the frame members 61.As will be noted in FIG. 1, the actuators 126 are mounted at an angle sothat, in addition to providing means for lifting the lower extremity ofthe elevator assembly 126, they can also be utilized as means forabsorbing side loading on the elevator assembly during operation of theapparatus.

The conveyor assembly 27 is of conventional type and is adapted toreceive the rock to be crushed as it is delivered by the elevatorassembly 26. The conveyor assembly 27 consists of an endless belt 131driven by a roller 132 mounted on a shaft 133. The shaft 133 isrotatably mounted in bearing blocks 134 carried by plates 136. Theplates 136 are afiixed to inclined frame members 137 afiixed to thevertical posts 64 and vertical posts 138 secured to the main frame 13 ofthe tractor. The shaft 133 is driven by an electric motor 139 through aright angle speed reducer 1 11. The upper run of the endless belt 131 issupported by a plurality of rollers 142 rotatably mounted on shafts 143carried by frame members 144 ailixed to the frame member 137. As can beseen in FIG. 6, the rollers are positioned so that a concave bed isprovided for the upper run of the endles belt 131. A pair of spacedparallel side guide plates 146 are provided which incline inwardly anddownwardly and have their lower extremities overlie the outer margins ofthe upper run of the endless belt 131 to prevent material from spillingover the sides of the belt as shown in FIG. 6.

The conveyor assembly 27 hereinbefore described delivers the rock to becrushed to a vibratory screen assembly 36. The vibratory screen assembly36 is of a conventional type such as the type DC Double Deck VibratingScreen Assembly manufactured by Kolman Manufacturing Co. of Sioux Falls,SD. As shown in the drawings, such a vibrating screen assembly consistsof a pair of spaced parallel side frame members 151 which have a pair ofspaced parallel superposed vibrating screens 152 and 153 disposedbetween the same. The vibratory screen assembly also includes aneccentric jack shaft 156 which, upon rotation, causes the screens 152and 153 to vibrate. The shaft 156 is provided with pulleys 157 onopposite ends which are driven by belts 158. The belts 158 are driven bysheaves 159 mounted on a shaft 161. The shaft 161 is driven by anelectric motor 162 through a right angle speed reducer 163. The screenassembly separates the large rock entering the screen assembly into twodifferent sizes. For example, the upper screen could separate out allrock which will not pass through 4" by 4" openings and the lower screencould separate out all rock which will not pass through 1%" by 1 /2"openings.

The material which passes through both screens 152 and 153 of thevibratory screen assembly 36 falls downwardly onto a downwardly inclinedchute 166 mounted upon the frame 31 of the trailer 12 below the screenassembly 36. The chute 166 delivers the material to an endless belt 167which is disposed in a substantially horizontal plane and is driven by aroller 168. The roller 168 is driven by a motor 169 through a rightangle speed reducer 171. The belt 167 is also mounted upon an end roller1'72. A plurality of idler rollers 173 are provided which support theupper run of the belt 167.

The rock crusher 38 consists of three sections; a center section 176 andtwo outer or side sections 177 and 178. The chute assembly 37 consistsof a hopper 179 which receives the large rock which will not passthrough the large upper screen 152 and delivers it to the center section176 of the rock crusher. The chute assembly 37 also consists of a doublechute 180 (FIG.1) which receives the intermediate size rock which willnot pass through the screen 153 and delivers it to the two side sections177 and 178.

The rock crusher 38 consists of a crusher base or frame which is formedof a pair of reinforced side walls 182 and 183, a front wall 184 and arear wall 186. It also includes a pair of dividing walls 187 and 188which sepa rate the center section 176 from the two side sections 177and 173. An eccentric shaft 191 is rotatably mounted in roller bearingassemblies 192 carried by pillow blocks 193 mounted upon the side walls182 and 183 and upon the divider walls 187 and 188. The sheaves 48 serveas fly wheels and are mounted on opposite ends of the shaft 191 and aredriven as hereinbefore described.

A pitman assembly is mounted on the eccentric shaft 191 for each of thesections of the crusher. Thus, a pitman assembly 201 is provided for thecenter section 176 and pitman assemblies 202 and 203 are provided forthe side sections 177 and 178. As shown in FIG. 1, the pitman assembliesare rotatably mounted upon the shaft 191 by bearing assemblies 204. Eachof the pitman assemblies 201, 202 and 203 is similar in constructionwith the exception of certain details which are pointed out hereinafter.The pitman assembly 201 is shown in detail in FIG. 8. Each of the pitmanassemblies consists of an upper pitman section 206 and a lower pitmansection 207. The upper pitman section 206 is directly mounted upon theeccentric shaft 191, whereas the lower pitman section is connected tothe upper pitman section by a link 208 which has one end pivotallyconnected to the lower extremity of the upper pitman section 2 06 by apin 209 and is pivotally connected to the upper portion of the lowerpitman section 207 by a pin 211.

Movement of the lower extremity of the upper pitman section 206 iscontrolled by a toggle plate 213, one end of which is engaged by anarcuate bearing member 214 mounted on the lower extremity of the upperpitman section 206. The other end of the toggle plate 213 is disposed ina movable slide plate 216 which is slidable horizontally in ways (notshown) in members 217 and 218 mounted upon the rear wall 186 of thecrusher base 181. The slide plate 216 is provided with an inclinedsurface 219 which is adapted to cooperate with an inclined surface 221provided on a block 222 which is mounted for vertical movement in themembers 21.7 and 218. Means is provided for vertically positioning ablock 222 relative to the block 216 and consists of a screw 223 securedto the block 222 and which is adapted to be moved vertically by ahydraulic motor 224 mounted upon the rear wall 186.

Means is provided for retaining the upper pitman section in engagementwith the toggle plate 213 and consists of a tie rod 226 which ispivotally mounted on the pin 209 and which extends through the rear wall186 and has a tensioning spring 227 retained thereon by nuts 228. It canbe seen that by adjusting the nuts 228, the desired amount of tensioncan be placed upon the tie rod 226.

Means is provided for adjusting the position of the link 228 andconsists of a link 229 pivotally connected by a pin 230 to the link 208and pivotally connected to a block 231 by pin 232. The block 231 isslidably mounted in a slot 233 in a block 234. The block 234 is slidablymounted in ways (not shown) provided in members 236 afiixed to the rearwall 186. Means is provided for adjusting the horizontal position of theblock 234 and consists of a screw 237 which is secured to the block 234and can be moved horizontally by hydraulic motor 238. Means is providedfor shifting the block 231 in a vertical direction and consists of ascrew 239 threaded through the block and driven by an actuator motor240.

The position of the lower extremity of the lower pitman section 207 iscontrolled by a toggle plate 241 which engages a bearing member 242provided in the lower portion of the lower pitman section 207. The otherend of the toggle plate is carried by a block 243 movable horizontallyin ways (not shown) in members 244 secured to the rear wall 186. Meansis provided for moving the block 243 horizontally and consists of ascrew 246 secured to the block and driven by a hydraulic motor 247.Means is provided for retaining the lower pitman section in engagementwith the toggle plate 241 and consists of a tie rod 248 pivotallyconnected by a pin 249 to the lower portion of the lower pitman section207. The tie rod 248 extends through the rear wall 186 and 6 istensioned by a spring 251 retained on the rod by nuts 252.

The upper pitman section 206 and lower pitman section 207 are providedwith removable wear plates 253 and 254, respectively. Thus, it can beseen that the upper pitman section 206 and the lower pitman section 207,in conjunction with the wear plates 253 and 254, provide movable oroscillating jaw sections for the rock crusher which are progressivelymoved toward and away from the stationary or fixed jaw formed by wearplates 256 removably secured to the front wall 184. Cheek or wear plates257 are provided on the inner surface of the side walls 182 and 183 andcheek or wear plates 258 are also provided on opposite sides of thedivider walls 187 and 188.

In the arrangement shown, the center section 176 of the rock crusher canbe called the primary section and can have a suitable opening such as24" by 30", whereas the two side sections 177 and 178 can be consideredto be secondary crushers and have smaller openings as, for ex ample,openings of 12" by 4 /2". The smaller dimensions of the inlets of thetwo side sections can be seen from FIGS. 7 and 9 of the drawings inwhich the side sections have only approximately one-half the length ofthe center section and less than one-half the width of the centersection. However, it will be noted that the upper pitman sections 206for the two side sections widen out to the same length as the centerptiman section commencing approximately one-half the depth of the upperpitman section so that the lower extremity of the upper pitman sectionis the same length as the upper pitman section for the center section176. The lower pitman sections 207 are all the same length as can beseen from FIG. 9.

Operation and use of the self-propelled mobile rock crushing apparatusmay now be briefly described as follows. The apparatus can be driven tothe desired location or, if necessary, it can be transported to thelocation in which it is desired to work. For example, let it be assumedthat it is desired to utilize the rock crusher on a road which hasalready been supplied with rock or that there is natural rock in theroadway which can be utilized for forming the road. When such is thecase, prior to utilization of the apparatus, the rock which is to becrushed is shifted into one or more windrows extending along the road bythe use of a blade or other similar equipment. The apparatus is thenpositioned so that it can travel up the road. The hydraulic actuators126 are operated to lower the elevator assembly so that the casterwheels 68 are resting upon the ground. The caster wheels 68 are thenadjusted relative to the frame member 61 so that the guide shoes 81 arealso resting upon the ground. The apparatus is then positioned so thatthe space between the guide shoes 81 is lined up with the windrow ofrocks to be crushed.

All of the electric motors are energized from the power supply providedby the generator 54 and the rock crusher is caused to advance at thedesired speed. The rock is moved inwardly by the guide shoes 81 as theapparatus is advanced so that the rocks are picked up by the elevatorassembly 26. The elevator assembly 26 travels in a counter-clockwisedirection as viewed in FIG. 3 and picks up the rock to be crushed andcarries the rock upwardly on the bottom plate 86 and deposits the sameonto the conveyor assembly 27.

It has been found that the elevator assembly 26 has a number ofadvantages in that it can assimilate rocks of various sizes withoutdamaging the elevator assembly. For example, if a particularly largerock enters the elevator assembly, the lower extremity of the uppersection 59 can be lifted upwardly by use of the air operated actuators117 so that it will clear the rock. The rock can then be removed and theupper section 59 lowered to permit it to float on the lower section 58.If desired, the upper section 59 can be positioned by use of theactuators 117 to provide any desired spacing between the scoop-likemembers 111 and the bottom plate 86.

As hereinbefore described, the entire elevator assembly 26 is pivoted onthe shaft 62 so that in the event the elevator assembly strikes a rockwhich is lodged in the ground, the entire lower portion of the conveyorassembly including the frame members 61 can be lifted upward- 1y toclear the rock. Thus, it can be seen that the lower section of theelevator assembly is mounted for pivotal movement and that the uppersection is mounted for pivotal movement with respect to the lowersection to permit the advantageous operation hereinbefore described.

The endless chain with the scoop-like members 111 are constructed insuch a manner that they can handle relatively large rocks without dangerof damage to the elevator assembly. In the event one of the scoop-likemembers strikes a rock, the entire upper section 59 of the elevatorassembly will be lifted until the scoop-like member clears the rock andto thereafter permit the rock to be engaged by the following scoop-likemember and elevated onto the conveyor assembly 27.

The conveyor assembly 27 operates in a conventional manner to deliverthe rock to the vibratory screen assembly. The elevator assembly 26 andthe conveyor assembly 27 has been mounted upon the tractor 11 tofacilitate turning of the apparatus and also to limit the total heightto which the apparatus must be built to permit rock to be delivered tothe vibratory screen assembly. However, it can be appreciated that, ifdesired, the elevator assembly could be constructed so that it coulddeliver rock direct y to the vibratory screen assembly.

The vibratory screen assembly separates the smaller material as, forexample, all rocks and material which can pass through a screen rangingfrom 2 inches down to and including 1 inch, and permits the same to fallupon the chute 166 which delivers it onto the belt 167 which carries thematerial rearwardly and drops the same upon the road bed. The largermaterial which will not pass through the vibratory screen assembly isdelivered to the chute 37 and is delivered to the rock crusher 38. Ashereinbefore described, the larger rock is delivered to the centersection 176 of the rock crusher, whereas the intermediate size rock isdelivered to the side sections 177 and 178.

Upon operation of the rock crushing apparatus, the movable oroscillating jaws move toward and away from the fixed jaws to cause therock to be crushed. As the rock is crushed, it moves downwardly throughthe rock crusher and is crushed still further. As hereinbeforeexplained, the oscillating jaws are provided in two, or upper and lower,sections which makes it possible to achieve a relaitvely fine rock fromeven very large rock by one pass through the rock crusher. The size ofthe discharge opening between the upper movable jaw and the fixed jaw isadjusted by movement of the toggle plate 213 by operation of thehydraulic motor 224. Similarly, the discharge opening between the lowermovable jaw and the fixed jaw of the rock crusher is adjusted by theposition of the toggle plate 241 by operation of the motor 247.

The size of the inlet between the lower movable jaw and the fixed jaw isdetermined by the position of the lower portion of the upper jaw and bythe position of the link 229 as determined by motor 233.

The amount of oscillatory movement which is imparted to the lower pitmanor movable jaw section by the upper pitman section is controlled by thevertical position of the link 229 as determined by the motor 240. As theblock 231 is raised, the movement which is imparted to the lower pitmansection 207 by movement of the upper pitman section 266 is increased.Conversely, when the opposite movement of the block 231 occurs, theoscillatory movement of the upper portion of the lower pitman sec tion207 or jaw towards the fixed jaw is decreased.

Thus, it can be seen that by controlling the positions of the toggleplates 213 and 241, it is possible to control the sizes of the dischargeopenings of the upper and lower portions of each of the crusher sectionsso that material of the desired size is supplied to the road bed. Theamount of crushing action which is accomplished by the lower section canbe adjusted by adjusting the vertical position of the block 231.

With the foregoing rock crushing apparatus, it can be seen that rock ofrelatively large sizes can be delivered to the rock crusher and can becrushed to a relatively fine size so that they can be dischargeddownwardly directly to the road bed in the desired size with only asingle pass through the rock crusher. By providing the two side sectionsto receive the smaller rock, the capacity of the rock crusher is greatlyincreased while still delivering rock of the same size from each of thesections. By use of the foregoing apparatus, it can be seen that rockwhich is on the site can be crushed and placed into use without thenecessity of loading the rock and moving the same to a rock crusher andthen returning with the rock to deliver the same to the road bed. Also,by the use of such apparatus, it is possible to greatly reduce the costof providing crushed rock for the road bed. The machine is constructedin such a manner that it can be operated by one man to greatly reducethe labor requirements for providing crushed rock for the surfaces ofroads. Since the apparatus is mobile, it can be readily moved from onelocation to another without the loss of any substantial time. Theapparatus is such in which the size of the rock which is discharged fromthe rock crusher can be adjusted automatically by the operator bycontrolling the hydraulic motors 224, 238, 240 and 247 for each of thesections of the rock crusher.

I claim:

1. In a rock crushing apparatus, a mobile wheeled framework, a pickupelevator mounted on the framework for picking up rock from the ground, arock crusher mounted on the framework, said rock crusher being providedwith two sections arranged side by side with one section being formedwith an inlet opening to receive rock of one size and the other sectionbeing formed with an inlet opening to receive rock of a different size,said rock crusher having a common shaft for both said sections, avibratory screen assembly mounted on the framework, means for deliveringrock from the pickup elevator to the vibratory screen assembly, meansdisposed below the vibratory screen assembly for receiving materialpassing through the vibratory screen assembly and delivering the same tothe road bed on which the rock crusher travels, and means adjacent tothe discharge portion of the vibratory screen assembly for deliveringrock which does not pass through the vibratory screen assembly to therock crusher in two different ranges of sizes.

2. Apparatus as in claim 1 together with a conveyor assembly mounted onthe framework for delivering the rock from the pickup elevator assemblyto the vibratory screen assembly.

3. In a rock crushing apparatus a wheeled framework, a pickup elevatormounted on the framework for picking up rock from the ground, a rockcrusher mounted on the framework, said rock crusher being provided withtwo sections arranged side by side with one of the sections being formedwith an inlet opening to receive rock of one size and the other sectionbeing formed with an inlet opening to receive rock of a different size,said rock crusher including a common shaft for both sections, each ofsaid sections of said rock crusher being provided with a fixed jaw,upper and lower oscillating jaws movable toward and away from said fixedjaw, means pivotally connecting the lower movable jaw so that as theupper movable jaw is moved the lower movable jaw is moved, and means foradjusting the discharge openings between the upper movable jaw and thefixed jaw and the lower movable jaw and the fixed jaw, and means fordelivering rock 9 from the elevator means to the rock crusher in twodifferent ranges of sizes.

4. Apparatus as in claim 3 wherein said means connecting the lowermovable jaw to the upper movable jaw consists of a link pivotallyconnected to the lower portion of the upper movable jaw and pivotallyconnected to the upper portion of the lower movable jaw.

5. Apparatus as in claim 4 together with means for adjustablypositioning the link connecting the lower movable jaw to the uppermovable jaw.

6. Apparatus as in claim 5 wherein said means for adjustably positioningthe link includes means for moving the lower portion of the link in avertical direction.

7. Apparatus as in claim 1 wherein said elevator assembly is comprisedof upper and lower sections, said lower section being comprised of apair of spaced parallel frame members and a bottom plate extendingbetween said frame members, means pivotally mounting said bottom framemembers on said frame, said upper section being comprised of a pair ofspaced parallel frame members, a pair of shafts rotatably mounted insaid frame members, means pivotally mounting said upper frame members tosaid lower frame members, a pair of sprockets mounted on said shaft, anendless chain carried by the shaft, and a plurality of scoop-likemembers carried by said endless chain.

8. A rock crusher as in claim 7 together with means for causing raisingand lowering of said upper section with respect to said lower section.

References Cited UNITED STATES PATENTS 197,643 11/1877 Lanyon 241-1402,114,078 4/1938 Jackson 94-40 2,256,731 9/1941 Winther 241-l01 X2,325,719 8/1943 Turner 241-101 X 2,397,613 4/1946 Madsen 180142,585,224 2/1952 Campbell 241101 X 2,593,353 4/1952 Shelton 241-l012,595,219 5/1952 Anderson 24114() ROBERT C. RIORDON, Primary Examiner D.G. KELLY, Assistant Examiner US. Cl. X.R.

